It was several minutes before I was ____ of what was happening.
| A．fond of | B．realized | C．aware of | D．prepared of |
I'll never forget the day __________ we worked together.
| A．when | B．which |
| C．that | D．where |
We have been caught __________ the rain and are really wet __________ the skin.
| A．in; to | B．by; on |
| C．in; through | D．with; over |
Tony was caught __________ at the meeting, which annoyed his boss.
| A．chatting | B．chat |
| C．chatted | D．to chat |
I hate going out alone, so I often ask my friend to __________ me.
| A．defend | B．protect |
| C．accompany | D．guard |
In spite of all the efforts __________ these endangered species, many of them have died out over the years.
| A．to protect | B．protecting |
| C．protected | D．having protected |